Socket Based Server's Performance?

Question

Now i am write a prototype of a Server, using Socket/ServerSocket to communicate.
The problem is that the performance is low:(
When the Server listens the Client Input Stream i use a loop forever to detect the Input Stream, this cause the usage rate of CPU is so high(80%~95%).
It is so expensive, and other Application runs Slow.
So any advise to me?
3ks.

Answer 1

Two choices, one using "standard" IO and one using the "nio" packages.
With standard IO - each connection from a client is spun into its own Thread. Each Thread blocks at the read. There is no "busy wait" loop; the main ServerSocket is blocked waiting for new connections, any existing connections are blocked on reads. When new data comes in, the appropriate Thread wakes up, does whatever it does, and goes back to reading.
The downside of this is that it doesn't scale to large numbers of simultaneous connections. Too many Threads will choke any machine (esp. when "too many" gets into the 1's or 10's of thousands...) With the "nio" packages, you can have one Thread handle many connections at one, by using select() and looking to see which ones have data ready.
Sounds like you need to bone up on server design, tho - this is a well-understood problem, and there's lots of writing about it out there. Google (or a good tech bookstore) is your friend!
Good luck